abra app backup create (backup-bot-two) stops/cycles the app container, so a mutate exec_in_app right after backup hit an empty docker ps and raised. _app_container now polls (no bare sleep) for the container to reappear within a timeout. Recipe-agnostic harness robustness. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>